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Interview Questions and Answers for 'Wells Fargo' - 7 question(s) found - Order By Rating | ||||
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Ans. Singleton class will have only one instance through out your application. Once the instance has been created, you can use it to change the state of that object, whereas for immutable class you cannot change the value that means you cannot change the state of it once assigned. If you want to change the state/ different values, you can very well create two instance for that immutable class which JVM will allow. | ||||
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Ans. By making the constructor private | ||||
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Ans. 1. Arrays don't provide any built in support for sorting searching like operation and we need to do it explicitly. 2. It can hold only homogeneous objects, 3. We have to reserve memory as no dynamic expansion allowed. | ||||
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Like Discuss Correct / Improve  arrays  arraylist  arrays vs arraylist Asked in 3 Companies | ||||
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Ans. A DOM (Document Object Model) parser creates a tree structure in memory from an input document whereas A SAX (Simple API for XML) parser does not create any internal structure. A SAX parser serves the client application always only with pieces of the document at any given time whereas A DOM parser always serves the client application with the entire document no matter how much is actually needed by the client. A SAX parser, however, is much more space efficient in case of a big input document whereas DOM parser is rich in functionality. Use a DOM Parser if you need to refer to different document areas before giving back the information. Use SAX is you just need unrelated nuclear information from different areas. Xerces, Crimson are SAX Parsers whereas XercesDOM, SunDOM, OracleDOM are DOM parsers. | ||||
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Like Discuss Correct / Improve  java   xml   parsers   sax   dom parser   difference   architecture   technical lead   technical architect  markup language   sax vs dom Asked in 14 Companies   frequent | ||||
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Very frequently asked.Usually among first few questions. | ||||
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Ans. MVC is a Design Pattern that facilititates loose coupling by segregating responsibilities in a Web application 1. Controller receives the requests and handles overall control of the request 2. Model holds majority of the Business logic, and 3. View comprise of the view objects and GUI component | ||||
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Like Discuss Correct / Improve  j2ee   mvc   mvc design pattern   design pattern   struts   spring   web application   web frameworks   ebay Asked in 60 Companies basic   frequent | ||||
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Ans. ConcurrentHashMap is a hashMap that allows concurrent modifications from multiple threads as there can be multiple locks on the same hashmap. | ||||
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Like Discuss Correct / Improve  java   collections   hashmap   map   concurrenthashmap   concurrenthashmap  concurrency   general electric   ge Asked in 32 Companies   rare | ||||
Frequently asked at Manhattan Associates ( Based on 2 feedback ) | ||||
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Ans. Its an anonymous method without any declaration. Lambda Expression are useful to write shorthand Code and hence saves the effort of writing lengthy Code. It promotes Developer productivity, Better Readable and Reliable code. | ||||
Sample Code for lambda | ||||
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Like Discuss Correct / Improve  java   java8   lambda expression   architecture Asked in 58 Companies expert   frequent | ||||
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